Unless they can get Halo 5 as a launch title I may not be interested in buying this system on day one.
It will take have to look pretty darn good graphics and specifications wise for me to buy the console on launch without Halo 5 being a launch title.
Otherwise this really isn't that surprising for me.
Microsoft never denied that they where making a new Xbox to begin with, they only said that the Xbox 360's "life cycle" isn't complete yet and they have no intention on releasing a new console until that "life cycle" ends.
I'm excited to hear this, but like ToCool said, as much as I play and love my Xbox, this may not be a day one purchase for me without Halo 5. Hopefully the new Xbox will have BluRay though, that'd be quite nice.